{"record":{"id":"ab4112ed9447f76d","repo":"bevyengine/bevy","slug":"attempted-to-load-type-0-which-does-not-have","errorCode":null,"errorMessage":"Attempted to load type \"{0}\", which does not have `ReflectFromReflect` in the type registry. This may occur for types that have opted-out of `FromReflect`","messagePattern":"Attempted to load type \"(.+?)\", which does not have `ReflectFromReflect` in the type registry\\. This may occur for types that have opted-out of `FromReflect`","errorType":"exception","errorClass":"ReflectedRonDeserializeError::MissingReflectFromReflect","httpStatus":null,"severity":"error","filePath":"crates/bevy_asset/src/common_loaders/ron.rs","lineNumber":457,"sourceCode":"        Ok(writer.write_all(string.as_bytes()).await?)\n    }\n}\n\n/// An error type for RON loading.\n#[derive(Error, Debug)]\npub enum RonDeserializeError {\n    #[error(transparent)]\n    IoError(#[from] std::io::Error),\n    #[error(transparent)]\n    RonSpan(#[from] ron::de::SpannedError),\n}\n\n/// An error type for RON loading using reflection.\n#[derive(Error, Debug)]\npub enum ReflectedRonDeserializeError {\n    #[error(transparent)]\n    Ron(#[from] RonDeserializeError),\n    #[error(\"Attempted to load type \\\"{0}\\\", which does not have `ReflectFromReflect` in the type registry. This may occur for types that have opted-out of `FromReflect`\")]\n    MissingReflectFromReflect(&'static str),\n    #[error(\"Attempted to load type \\\"{0}\\\", which does not have `ReflectAsset` in the type registry. Make sure to add `#[reflect(Asset)]` to your type\")]\n    MissingReflectAsset(&'static str),\n}\n\n/// An error type for RON saving.\n#[derive(Error, Debug)]\npub enum RonSerializeError {\n    #[error(transparent)]\n    IoError(#[from] std::io::Error),\n    #[error(transparent)]\n    Ron(#[from] ron::Error),\n}\n\n/// An error type for RON saving using reflection.\n#[derive(Error, Debug)]\npub enum ReflectedRonSerializeError {\n    #[error(","sourceCodeStart":439,"sourceCodeEnd":475,"githubUrl":"https://github.com/bevyengine/bevy/blob/a62cce8c05ceacd3bd102e678c83e2b42e5dfbe2/crates/bevy_asset/src/common_loaders/ron.rs#L439-L475","documentation":"ReflectedRonDeserializeError::MissingReflectFromReflect is thrown by the RON asset loader when deserializing a value whose type has not had ReflectFromReflect (FromReflect) registered in the TypeRegistry. Bevy needs ReflectFromReflect to reconstruct the concrete value from reflected data. Types can lack it by omission or by explicitly opting out of FromReflect.","triggerScenarios":"Loading a .ron asset whose registered type or any field's type was never derived/registered with ReflectDeserialize+FromReflect via #[reflect(...)] and app.register_type_data::<T, ReflectFromReflect>() (usually via #[derive(Reflect, FromReflect)] + register_type).","commonSituations":"Forgetting register_type::<T>() for a nested field type in a RON asset; a type that derives Reflect but opts out of FromReflect; plugin registration order leaving the type registry incomplete before asset load.","solutions":["Derive FromReflect (and Reflect) on the type and call app.register_type::<T>() so ReflectFromReflect is registered","If FromReflect is intentionally not derived, register the type data manually: app.register_type_data::<T, ReflectFromReflect>()","Check nested field types in the RON asset — the missing type may be deep in the struct, not the root","Register the types before triggering the asset load (e.g., in a plugin's build, not after)"],"exampleFix":"// before\n#[derive(Reflect)]\nstruct LevelConfig { spawns: Vec<Spawn> }\n\n// after\n#[derive(Reflect, FromReflect)]\nstruct LevelConfig { spawns: Vec<Spawn> }\napp.register_type::<LevelConfig>();\napp.register_type::<Spawn>();","handlingStrategy":"validation","validationCode":"fn is_registered_ron_ready<T: FromReflect + GetTypeRegistration>(app: &App) -> bool {\n    let reg = app.world().resource::<AppTypeRegistry>().0.read();\n    reg.get(TypeId::of::<T>()).map_or(false, |r| r.data::<ReflectFromReflect>().is_some())\n}","typeGuard":"fn has_reflect_from_reflect(registry: &TypeRegistry, ty: TypeId) -> bool {\n    registry.get(ty).map_or(false, |r| r.data::<ReflectFromReflect>().is_some())\n}","tryCatchPattern":null,"preventionTips":["Register every type reachable from a RON asset, including nested fields","Derive FromReflect alongside Reflect","Run a startup check that all asset types are registered before loading"],"tags":["bevy","assets","reflection","ron"],"backgroundTag":"missing-type-registration","analyzedSha":"a62cce8c05ceacd3bd102e678c83e2b42e5dfbe2","analyzedAt":"2026-09-19T21:23:06.616Z","contentChangedAt":"2026-09-19T21:23:06.616Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}